Safety-stop for elevators.



J. SKABA.

SAFETY STOP FOR ELBVATORS.

AYPLIUATION FILED APR. 19, 1909.

Patented F61). 22, 1910.

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'NTED STATES PATENT OFFICE.

JOI-IN SKABA, OF BRAIDWOOD, ILLINOIS, ASSIGNOR 0F ONE-HALF TO JAMES JIRUS, SR., OF BRAIDWOOD, ILLINOIS.

SAFETY-STOP FOR ELEVATORS.

Specification of Letters Patent.

Application led April 19, 1909.

Patented Feb. 22, 1910.

serial No. 490,858.

To all whom it may concern:

Be it known that I, JOHN SKABA, a citizen of the United States, residing at Braidwood, in the county of lVill and State of Illinois, have invented certain new and useful Improven'ients in Safety-Stops for Elevators, of which the following is a specifi4 cation.

This invention relates to the class of elevators used in buildings and mine shafts; and has for its object to provide a safety device that will automatically arrest the movement of elevator car and prevent the same from dropping should the cable be :accidentally broken.

Figure l is an elevation. Fig. 2 is a horizontal section on line Q, Fig. 3, a portion of the car floor being broken away. Fig. 3 is a vertical section on line 3, Fig. 2. Fig. 4t is a vertical section on line 4, Fig. 2, showing the locking bolts in their engaged position. Fig. 5 is a similar view,showing the bolts in their disengaged or normal position.

The framed-sides lining the elevator shaft, and consisting of the uprights A and the horizontal connecting pieces E, may be of any or the usual form of skeleton frame construction and will not be described in detail.

C may represent the elevator car, D the vertical guides therefor', and E the main elevator cable. The elevator cable E is in this instance connected to a ring G, as shown in Fig. 1. Two branch cables 7 extend from this ring to opposite sides of the car and connect with a rigid part thereof. The branches 7 are a continuation of the elevator or suspension cable E. Two other branch cables 8 connect the ring 6 and a cross-bar 9, which actuates the locking mechanism. The cross-bar 9 is located over the top of the car and normally is spaced apart therefrom, as best shown in Figs. 3, 4 and 5. The companion cords 10 are secured to the respective ends of the cross-bar 9 and extending downward therefrom, the lower end of each connecting with the outer end of an arm 11 mounted on a rock-shaft l2 near its longitudinal center, as best shown in Fig. 2.

It will be understood that the locking mechanism is in duplicate and located on opposite sides at the bottom of the car; the same reference characters being used on duplicate parts. In this instance two lockingbolts lt and 15 are used and which are located at opposite sides, as best shown in Fig. Q. The inner ends of the locking-bolts are each secured to a bifurcated member 1G, the outer free ends being adapted to engage any of the horizontal stop-bars 17 forming a part of the frame-work lining the elevator shaft. These stop-bars are disposed at intervals of approximately six inches so that should the cable break or become slack the car will move but a short distance before the bolts let and 15 will be thrown into a locking engagement. and the descent of the car arrested. The links 19 form an operative con nection between the rocleshafts 12 and the bifurcated members 1G. A rod 2O connects the inner ends of the members 1G, and has one end of a spring Q1 secured thereto. The opposite end of this spring or springs is secured to a stationary part of the car. lVhcn the elevator cable is taut the strain, through the medium of the cross-bar 9 and the cords l0. holds the arms l1. up against the under side of the car as shown in Figs. 3 and 5. Corresponding to this position the bolts 14 and 15 are retracted from their locking position and the springs '2l expanded, as shown in Figs. 2 and 8. Should an accident happen to the cable so that it does not control the movement of the car, the crossbar 9 will drop and the strain on the cords l0 be relaxed when the springs 21 on opposite sides will have the effect of shooting the bolts into their engaged locking posi tion and the car prevented from dropping. When the car is again suspended on its cables the cords 10 are drawn taut and the bolts retracted from their position against the tension of their operating springs and lea ving the car free to move in either direction.

This arrangement provides a safety means that is positive and direct in operation and guards against the possibility of accidents.

Having thus described my invention, what I claim is- In a device of the character described, the combination with an elevator car and its shaft, of a plurality of stop members located at the sides of the shaft. a suspension cable, connections between said cable and the elevator car, a cross bar extendingacross the top of the elevator car, a rock shaft located upon each side of the elevator car and under the I bottom there-of, an operating arm carried by portion of the elevator car, whereby eaoli eaoli of saicl Shafts, connections between said spring actuates a pair of said bolts. 10 j arms and said cross bar, a pair of bolt aotu- In testimony whereof I affix my Signature ating arms carried by each rock shaft, a pair in presence of two witnesses. of bolts connected to each of said pairs of JOHN SKABA. arms, a connecting member extending be- Vitnesses: tween each pair of bolts, and a Spring con- FERDINAND KooKA, neotecl to each connecting member and to a y l/VILLIAM MALEK. 

